I jailbroke my iPod touch (4th gen) a few month ago with the ios 6.1.3 tethered jailbreak using redsn0w and recently wanted to restore and get the absinthe untethered jailbreak but when I plug it in my laptop recognises it but iTunes comes up with "an unknown error" then an error code and wont detect it but if I plug in my iPhone it works fine. please help me. Forgot to mention my ipod lags really bad running at the most 53mb RAM. plus the only things from cydia are themes and a few tweaks.